Method and system of deploying ignition interlock device functionality

ABSTRACT

A method and a system of deploying an ignition interlock device (IID). The method comprises receiving a time series of breath alcohol content (BrAC) measurements that are unitarily sourced from a pre-identified user, each BrAC measurement of the time series including an alveolar breath component and an interferent breath component; estimating a dissipation rate of alcohol attributable to the pre-identified user in accordance with the time series of BrAC measurements; determining, responsive to estimating the dissipation rate of alcohol, at least a subset of the BrAC measurements as being based on the alveolar breath component but not the interferent breath component; and performing one of triggering and not triggering the IID into a lockout state based on the at least a subset of the BrAC measurements.

TECHNICAL FIELD

The disclosure herein relates to vehicle ignition interlock devicesdeployed in breath alcohol monitoring and interfaces associatedtherewith.

BACKGROUND

Vehicles can incorporate breath alcohol ignition interlock devices (IID)to prevent a driver from operating a vehicle while intoxicated withalcohol. Such devices are designed to prevent a driver from starting amotor vehicle when the driver's breath alcohol content (BrAC) is at orabove a mandated alcohol concentration threshold. Each state in the U.S.has adopted a law providing for use of such IID devices as a sanctionfor drivers convicted of driving while intoxicated, or as a condition ofrestoring some driving privileges after such offenses.

In operation, a driver uses an IID device by blowing into a mouthpieceportion of the IID coupled to an alcohol-sensing element such as a fuelcell that measures alcohol content of the driver's breath, to provide anobjective representation or estimate of the blood alcohol concentrationof the driver's bloodstream. The IID reads a signal generated from thefuel cell, or similar alcohol-sensing element, and determines whetherthe operator's breath alcohol content exceeds a threshold amount. If theoperator's breath alcohol content does not exceed the threshold, theoperator is determined as not intoxicated, and the IID enables thevehicle for operation by electrically enabling a system within thevehicle, such as a starter, fuel pump, or ignition system. If the breathsample delivered from the driver to IID registers a higher breathalcohol content than the predetermined allowable threshold, the vehicleis disabled from starting, and the IID device records a violation, whichis also referred to as a failed sample.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a computing and communication system for deploying anignition interlock device (IID) in accordance with embodiments herein.

FIG. 2 illustrates an example architecture of a computing andcommunication device for deploying ignition interlock devicefunctionality.

FIG. 3 illustrates, in an example embodiment, a method of deployingignition interlock device functionality.

FIG. 4 illustrates, in an example embodiment, a user interface displaydeployment of ignition interlock device functionality.

DETAILED DESCRIPTION

Among other benefits and technical effects, embodiments provided hereinprovide ignition interlock functionality by way of triggering an IID toenact a vehicle operation lockout state in accordance with alveolarbreath components but not interferent breath components from a series ofbreath alcohol content (BrAC) measurements of a vehicle operator.

A typical IID device meets guidelines established by the NationalHighway Traffic Safety Administration (NHTSA) in published modelspecifications for IIDs, which specify various tests that such a devicemust pass to make it an effective and reliable deterrent to intoxicateddriving. For example, the model specifies tests designed to ensure aspecified minimum volume of breath is delivered at a specified minimumflow rate against less than a specified maximum back pressure to ensurethat an accurate result is produced, and specifies how such a deviceshould be installed into a vehicle to prevent the vehicle from operatingpending a determination that the driver is not intoxicated. The modelspecifications can also require that an installed IID pass are-calibration test within a specified tolerance for at least seven dayspast its mandated recalibration period, which can vary from 30 to 90days.

Embodiments herein recognize that legislation as enacted in most, if notall, jurisdictions are directed to preventing operation of a vehiclewhen the vehicle operator's blood alcohol content exceeds mandatedamounts, where breath alcohol content as measured via an IID is used asa proxy for, or a representative by correlation with, blood alcoholcontent of the vehicle operator. Embodiments herein further recognizethat presence of environmental, ambient, or other attendant non-ingestedalcohol-containing substances may sufficiently influence breath alcoholmeasurements, causing an increased risk of false positive results indetermining operator violations. Embodiments further recognize that anyalcohol content in alveolar air, or deep lung air, is caused by ingestedalcohol, or drinking events. Embodiments further recognize thatalveolar, or deep lung, breath alcohol content determines operatorbloodstream alcohol content to a much more significant degree thannon-ingested alcohol contained in ambient sources. Furthermore,embodiments recognize that operator alcohol dissipation, or decay, ratesof alcohol content are different for alveolar air breath samplesindicative of metabolized alcohol, versus interferent- based breathsamples.

The term interferent breath component as used herein indicates a breathsample alcohol content resulting from a non-ingested alcohol event. Thenon-ingested alcohol event, in some variations, is associated withnon-ingested substances containing at least some alcohol content, suchas mouthwash liquid, hand sanitizer fluid, or ambient vapor. To theextent that non-ingested alcohol-containing substances do not contributeto or affect blood alcohol content of a user of the IID, a breathalcohol detector may falsely indicate a higher level of alcoholintoxication than is actually the case, resulting in a false positiveviolation being generated.

As used herein, the term alveolar breath component refers to a breathalcohol content resulting from an alcohol consumption and ingestionevent that directly contributes to an operator blood alcohol content viametabolism in conjunction with the human bloodstream. Alveolar air, ordeep lung air, is generally presumed to be the primary component of abreath sample provided for measurement via the IID.

The likelihood of a discrete BrAC sample being due to an alcoholconsumption or ingestion event can be identified over time by lookingfor a pattern among a series of discrete samples. Calculating thedissipation rate across several samples and correlating it with the rateof alcohol metabolism in humans can provide context for the individualsamples, allowing for the individual samples to be designated on aviolation continuum from highly unlikely to very likely to be based onactual alcohol consumption (wine, beer, liquor, for example).

Provided is a method of deploying ignition interlock devicefunctionality. The method, executed in a processor of a mobile computingand communication device in one embodiment, comprises receiving a timeseries of breath alcohol content (BrAC) measurements that are unitarilysourced from a pre-identified user, each BrAC measurement of the timeseries including an alveolar, or deep lung, breath component and aninterferent breath component; estimating a dissipation rate of alcoholattributable to the pre-identified user in accordance with the timeseries of BrAC measurements; determining, responsive to estimating thedissipation rate of alcohol, at least a subset of the BrAC measurementsas attributable to the alveolar breath component but not the interferentbreath component; and performing one of triggering and not triggeringthe IID into a lockout state based on the at least a subset of the BrACmeasurements. A time series of breath alcohol content (BrAC)measurements is created by computing and storing the BrAC value of auser's breath each time the user provides a breath sample to the IID.Each time a user successfully provides a breath sample to the IID, a newentry to the time series is created. The IID computes the BrAC for thegiven sample and stores the computed BrAC as an entry in the timeseries. In an embodiment, the BrAC computed for the earliest acquiredbreath sample will be the first entry in the time series, the BrACcomputed for the second acquired breath sample acquired at a the secondearliest time will be the second entry in the time series, and so on.The BrAC computed for the nth acquired breath sample acquired at the nthtime will be the nth entry in the time series, etc.

Also provided is a computing system for deploying an ignition interlockdevice (IID). The computing system, in embodiments, includes a processorand a non-transitory memory storing executable instructions. Theinstructions, when executed in the processor causing operationsincluding receiving a time series of breath alcohol content (BrAC)measurements that are unitarily sourced from a pre-identified user, eachBrAC measurement of the time series including an alveolar breathcomponent and an interferent breath component; estimating a dissipationrate of alcohol attributable to the pre-identified user in accordancewith the time series of BrAC measurements; determining, responsive toestimating the dissipation rate of alcohol, at least a subset of theBrAC measurements as attributable to the alveolar breath component butnot the interferent breath component; and performing one of triggeringand not triggering the IID into a lockout state based on the at least asubset of the BrAC measurements.

Further provided is a non-transitory memory medium storing executableinstructions. The instructions, when executed in one or more processors,causing operations including accessing and displaying a time series ofbreath alcohol content (BrAC) measurements that are unitarily sourcedfrom a pre-identified user, each BrAC measurement of the time seriesincluding an alveolar breath component and an interferent breathcomponent; estimating a dissipation rate of alcohol attributable to thepre-identified user in accordance with the time series of BrACmeasurements; determining, responsive to estimating the dissipation rateof alcohol, at least a subset of the BrAC measurements as attributableto the alveolar breath component but not the interferent breathcomponent; and performing an evaluation as to whether the IID beingtriggered, or not triggered, into a lockout state based on the at leasta subset of the BrAC measurements constitutes a violation in accordancewith a predetermined breath alcohol threshold content.

One or more embodiments described herein can be implemented usingprogrammatic modules, engines, or components. Furthermore, one or moreembodiments described herein may be implemented through the use ofinstructions that are executable by one or more processors. Aprogrammatic module, engine, or component can include a program, asub-routine, a portion of a program, or a software component or ahardware component capable of performing one or more stated tasks orfunctions. As used herein, a module or component can exist on a hardwarecomponent independently of other modules or components. Alternatively, amodule or component can be a shared element or process of other modules,programs or machines.

Some embodiments described herein can generally require the use ofcomputing devices, including processor and memory resources. Forexample, one or more embodiments described herein may be implemented, inwhole or in part, on computing devices such as servers, desktopcomputers, mobile devices including cellular or smartphones, wearabledevices, tablet devices and laptop computing devices. Memory,processing, and network resources may all be used in connection with theestablishment, use, or performance of any embodiment described herein,including with the performance of any method or with the implementationof any system.

One or more embodiments described herein provide that methods,techniques, and actions performed by a computing device are performedprogrammatically, or as a computer-implemented method. Programmatically,as used herein, means through the use of code or computer-executableinstructions. These instructions can be stored in one or more memoryresources of the computing device. A programmatically performed step mayor may not be automatic.

FIG. 1 illustrates a computing and communication system 100 in deployingignition interlock device (IID) 101 in accordance with embodimentsherein. IID 101 includes a processor and a memory. The memory storesexecutable instructions, constituting IID deployment logic module 110,for triggering IID 101 into enacting a vehicle lockout state based on aset or subset of BrAC measurements in accordance with an alveolar breathcomponent but not an interferent breath component. In variations, someportions, or all, of the executable instructions constituting IIDdeployment logic module 110 may be hosted at server device 102, orlaptop or desktop computer 103 that are in communication with IID 101via communication network 104. In this scenario, there may not be an IIDdeployment logic module 110 located at the IID 101. If a user, orvehicle operator provides a sample at IID 101 that exceeds the mandatedbreath alcohol limit, then IID 101 will trigger a lockout, or disabled,state of the vehicle in which the IID is deployed.

FIG. 2 illustrates an example architecture of a breath alcohol ignitioninterlock device 101 for deploying ignition interlock devicefunctionality at least in part based on IID deployment logic module 110.In one embodiment, ignition interlock device 101 may include or beinterconnected with, for example, one or more of cellular or otherwireless computing and communication capable of telephony, messaging,and data computing services. Ignition interlock device may includeprocessor 201, memory 202, display screen 203, input mechanisms 204 suchas resistive- or capacitance-based input mechanisms orsoftware-implemented touchscreen input functionality, sensor devices205, and GPS module 206. IID 101 may also include capability fordetecting and communicatively accessing wireless communication signals,including but not limited to any of Bluetooth, Wi-Fi, RFID, and GPSsignals, and incorporate communication interface 207 for communicativelycoupling to communication network 104, such as by sending and receivingcellular data over data channels and voice channels.

IID deployment logic module 110, in one embodiment can be embodied in adownloaded mobile application stored in memory 202 of IID 101 mayinclude processor-executable instructions stored in RAM, for deployingfunctionality of IID 101.

IID deployment logic module 110 includes instructions executable inprocessor 201 to receive a time series of breath alcohol content (BrAC)measurements that are unitarily sourced from a pre-identified user, eachBrAC measurement of the time series including an alveolar, or deep lung,breath component and an interferent breath component.

IID deployment logic module 110 also includes instructions executable inprocessor 210 to estimate a dissipation rate of alcohol attributable tothe pre-identified user in accordance with the time series of BrACmeasurements.

IID deployment logic module 110 further includes instructions executablein processor 210 to determine, responsive to estimating the dissipationrate of alcohol, a subset of the BrAC measurements as attributable to analveolar breath component but not an interferent breath component.

In some variations, the alcohol dissipation rate attributable to theinterferent breath component exceeds 0.025 g/100 mL/hour, whereas thealcohol dissipation rate attributable to the alveolar breath componentranges from 0.015 to 0.025 g/100 mL/hour.

IID deployment logic module 110 also includes instructions executable inprocessor 210 to either trigger, or not trigger, the IID into a lockoutstate based on the at least a subset of the BrAC measurements.

In some embodiments, an alcohol dissipation rate of the interferentbreath component of the BrAC measurements exceeds an alcohol dissipationrate attributable to the alveolar breath component.

In some embodiments, the alveolar breath component is indicative of analcohol ingestion event.

In additional aspects, the interferent breath component is indicative ofa non-ingested alcohol event. The non-ingested alcohol event, in somevariations, is associated with non-ingested substances containing atleast some alcohol content, for instance, deriving from a mouthwashliquid, a hand sanitizer fluid, or an ambient vapor.

In some embodiments, the IID is triggered into the lockout state whenthe alveolar breath component of the at least a subset of the breathalcohol measurements indicates that a predetermined threshold of bloodalcohol content is exceeded.

In yet other aspects, the IID is not triggered into the lockout statewhen the alveolar breath component of the at least a subset of thebreath alcohol measurements indicates that a predetermined threshold ofblood alcohol content is not exceeded.

In some embodiments, the time series of BrAC measurements comprises aseries of breath sample BrAC measurements acquired from thepre-identified user at measured time intervals.

In some variations, the measured time intervals can be either a regularduration or an irregular duration between at least a trio of successiveBrAC measurements within the time series of breath sample BrACmeasurements. In some variations, the time series of BrAC measurementscan include three, four, five, six, seven, eight, or more measurements.In some variations, the time intervals between the BrAC measurements areat least about or are about thirty seconds, one minute, two minutes,three minutes, four minutes, or five minutes. In some variations, thetime intervals between the BrAC measurements are at most about twominutes, three minutes, four minutes, five minutes, seven minutes, eightminutes, nine minutes, 10 minutes, 15 minutes, 20 minutes, or 30minutes.

FIG. 3 illustrates, in an example embodiment, a method 300 of deployingignition interlock device functionality.

Examples of method steps described herein are related to the use of IID101 used in deploying IID functionality. According to one embodiment,the techniques are performed by the processor 201 executing one or moresequences of software logic instructions that constitute IID deploymentlogic module 110 of IID 101. In embodiments, IID deployment logic module110 may be hosted at server device 102 and is communicative with IID 101and portable or desktop computer 103, and includes sequences ofprocessor-executable instructions. Such instructions may be read intomemory 202 from machine-readable medium, such as memory storage devices.Executing the instructions of IID deployment logic module 110 stored inmemory 202 causes processor 201 to perform the process steps describedherein. In alternative implementations, at least some hard-wiredcircuitry may be used in place of, or in combination with, the softwarelogic instructions to implement examples described herein. Thus, theexamples described herein are not limited to any particular combinationof hardware circuitry and software instructions.

At step 310, receiving a time series of breath alcohol content (BrAC)measurements that are unitarily sourced from a pre-identified user, eachBrAC measurement of the time series including an alveolar (deep lung)breath component and an interferent breath component.

At step 320, estimating a dissipation rate of alcohol attributable tothe pre-identified user in accordance with the time series of BrACmeasurements.

At step 330, determining, responsive to estimating the dissipation rateof alcohol, at least a subset of the BrAC measurements as attributableto the alveolar breath component but not the interferent breathcomponent.

At step 340, performing one of triggering and not triggering the IIDinto a lockout state based on the at least a subset of the BrACmeasurements

In some embodiments, an alcohol dissipation rate of the interferentbreath component of the BrAC measurements exceeds an alcohol dissipationrate attributable to the alveolar breath component.

FIG. 4 illustrates, in example embodiment 400, a user interface displaydeployment of ignition interlock device functionality. In embodiments, anon-transitory memory medium stores executable instructions, which, whenexecuted in one or more processors, cause operations includingaccessing, from the memory, and displaying at display interface 401 atime series 402 of breath alcohol content (BrAC) measurements that areacquired from a single pre-identified user, each BrAC measurement of thetime series including an alveolar breath component and an interferentbreath component; estimating a dissipation rate of alcohol attributableto the pre-identified user in accordance with the time series of BrACmeasurements; determining, responsive to estimating the dissipation rateof alcohol, at least a subset of the BrAC measurements as attributableto the alveolar breath component but not the interferent breathcomponent; and performing an evaluation as to whether the IID beingtriggered, or not triggered, into a lockout state based on the at leasta subset of the BrAC measurements constitutes a violation, or not aviolation, in accordance with a predetermined breath alcohol thresholdcontent.

Because interferents or contaminants can affect breathalyzers, theability for a system to identify a likelihood that a given reading isdue to a contaminant rather than an alcohol consumption event isadvantageous. Monitoring authorities can use this method to quickly scanand identify likely noncompliant drivers versus those who simply triedto start their car too soon after rinsing their mouth with mouthwash orrecently eating something containing a high concentration of yeast, forexample.

In illustrative embodiments of display interface 401, visual likelihoodindicator scale 403 displays one of five likelihood indicators that thebreath alcohol content as measured at the IID constitutes a violation.The visual likelihood indicator scale 403 is shown underneath theheading “Intoxavisor™Beta” in FIG. 4. In one embodiment, by hovering adisplay screen cursor over a resultant likelihood indicator scale 403,message 404 is invoked and rendered, providing additional detail ofalcohol dissipation rates associated with one or more particularviolations flagged within the time series of breath sample measurements.When a flagged BrAC appears within the data log, likelihood indicatorscale 403 also appears with “Highly Likely”, “Somewhat Likely”, “NeedsReview”, “Somewhat Unlikely”, “Highly Unlikely” indicated visually. Insome examples, the likelihood indicator scale 403 provides one of fiverecommendations or likelihood indicators regarding whether a particularviolation or failed breath test is a result of alveolar breath orinterferent breach. It is also possible for the likelihood indicatorscale 403 to provide one of a different number of likelihood indicators,such as two, three, four, six, or seven. The likelihood indicator fromthe likelihood indicator scale 403 will depend on the rate of decay of atime series of breath alcohol measurement samples. In some examples, ifthe time series of measurements indicates a faster dissipation rateconsistent with interferent alcohol, then the likelihood indicator maybe “Needs Review”, “Somewhat Unlikely”, or “Highly Unlikely”. In someexamples, if the time series of measurements indicates a slowerdissipation rate, consistent with alveolar alcohol, then the likelihoodindicator may be “Highly Likely” or “Somewhat Likely”, in some examples.

In one illustrative example embodiment, BrAC measurements before andafter a given failed sample are used to analyze the likelihood that thegiven failed sample was due to or primarily due to an alveolar breathcomponent of the breath sample. To analyze the given failed sample,three previous samples and five subsequent samples can be used, limitedto a timeframe: 60 mins prior to violation till the time it takes forthe alcohol to completely dissipate at the rate of 0.015 g/100 mL/hour.

A likely violation is determined if 3+ samples in excess of thresholdcontent with dissipation rate of 0.015 g/100 mL/hour exist and a samplewith dissipation rate >0.025 g/100 mL/hour doesn't exist.

A result is determined as unlikely to be a violation if 1 failed samplein excess of threshold content with subsequent sample dissipationrate >0.025 g/100 mL/hour within a 20 minute window.

In some embodiments, if a sample determined as a violation does not meetthe above conditions, it may be marked as indeterminate, or flagged foradditional review.

In another illustrative example embodiment shown in FIG. 4, BrACmeasurements before a given failed sample (four previous samples), areused to analyze the likelihood that the given failed sample was due toor primarily due to an alveolar breath component of the breath sample.In this example, the given failed sample was provided at 3:43:57 AM.Four previously provided samples are used to evaluate the dissipationrate, specifically, the samples provided at 3:36:43 AM, 3:30:53 AM,3:24:46 AM, and 3:13:41 AM. Each of these previous samples is within 60minutes of the given failed sample. Each of these samples also show afailed BAC measurement. In this example, the BrAC measurements at thefour previous timepoints are 0.054, 0.053, 0.055, and 0.062,respectively. This indicates a slower dissipation rate of from 0.015 to0.025 g/100 mL/hour. As a result, a conclusion is drawn that the alcoholpresent in the previous samples and the given sample dissipated at arate consistent with alcohol consumption rather than with interferentalcohol. That conclusion is reflected in the likelihood indicator“Highly Likely” shown for the BrAC Measurement of 0.053 at 3:43:57 AM.This conclusion is also present in the message 404 stating, “BrACViolation: Highly Likely. User supplied BrAC sample of 0.053. 2+previous samples dissipated at a rate consistent with beer/wine/liquorconsumption.”

As used in the specification and appended claims herein, the singularforms “a,” “an,” and “the” encompass plural referents unless the contentclearly dictates otherwise. It should also be noted that the term “or”is generally employed in its sense including “and/or” unless the contentindicates otherwise. Furthermore, as used in the disclosure herein andthe appended claims, the phrase “configured” describes a system,apparatus, or other structure that is constructed or configured toperform a particular task or adopt a particular configuration. Thephrase “configured” can be used interchangeably with other similarphrases such as arranged and configured, constructed and arranged,constructed, manufactured and arranged.

It is contemplated for embodiments described herein to extend toindividual elements and concepts described herein, independently ofother concepts, ideas or system, as well as for embodiments to includecombinations of elements recited anywhere in this application. Althoughembodiments are described in detail herein with reference to theaccompanying drawings, it is contemplated that the disclosure herein isnot limited to only such literal embodiments. As such, manymodifications including variations in sequence of the method steps inconjunction with varying combinations of user interface featuresdisclosed herein will be apparent to practitioners skilled in this art.Accordingly, it is intended that the scope of the invention be definedby the following claims and their equivalents. Furthermore, it iscontemplated that a particular feature described either individually oras part of an embodiment can be combined with other individuallydescribed features, or parts of other embodiments. Thus, the absence ofdescribing combinations, including user interface manifestations ofsuch, do not preclude the inventor from claiming rights to suchcombinations.

What is claimed is:
 1. A method of deploying an ignition interlockdevice (IID), the method comprising: receiving a time series of breathalcohol content (BrAC) measurements that are unitarily sourced from apre-identified user, each BrAC measurement of the time series includingan alveolar breath component and an interferent breath component;estimating a dissipation rate of alcohol attributable to thepre-identified user in accordance with the time series of BrACmeasurements; determining, responsive to estimating the dissipation rateof alcohol, at least a subset of the BrAC measurements as attributableto the alveolar breath component but not the interferent breathcomponent; and performing one of triggering and not triggering the IIDinto a lockout state based on the at least a subset of the BrACmeasurements.
 2. The method of claim 1 wherein an alcohol dissipationrate attributable to the interferent breath component of the BrACmeasurements exceeds a dissipation rate attributable to the alveolarbreath component.
 3. The method of claim 2 wherein the alcoholdissipation rate attributable to the interferent breath componentexceeds 0.025 g/100 mL/hour, and the dissipation rate attributable tothe alveolar breath component ranges from 0.015 to 0.025 g/100 mL/hour.4. The method of claim 1 wherein the alveolar breath component isindicative of an alcohol ingestion event.
 5. The method of claim 1wherein the interferent breath component is indicative of a non-ingestedalcohol event.
 6. The method of claim 5 wherein the non-ingested alcoholevent is associated with at least one of a mouthwash liquid, a handsanitizer fluid, and an ambient vapor.
 7. The method of claim 1 furthercomprising triggering the IID into the lockout state when the alveolarbreath component of the at least a subset of the BrAC measurementsindicates that a predetermined threshold of blood alcohol content isexceeded.
 8. The method of claim 1 further comprising not triggering theIID into the lockout state when the alveolar breath component of the atleast a subset of the BrAC measurements indicates that a predeterminedthreshold of blood alcohol content is not exceeded.
 9. The method ofclaim 1 wherein the time series of BrAC measurements comprises a seriesof BrAC measurements acquired from the pre-identified user at measuredtime intervals.
 10. The method of claim 9 wherein the measured timeintervals comprise one of a regular duration and a random durationbetween at least a trio of successive BrAC measurements within the timeseries of BrAC measurements.
 11. A computing system for deploying anignition interlock device (IID), the computing system comprising: aprocessor; a memory storing a set of instructions, the instructions whenexecuted in the processor causing operations comprising: receiving atime series of breath alcohol content (BrAC) measurements that areunitarily sourced from a pre-identified user, each BrAC measurement ofthe time series including an alveolar breath component and aninterferent breath component; estimating a dissipation rate of alcoholattributable to the pre-identified user in accordance with the timeseries of BrAC measurements; determining, responsive to estimating thedissipation rate of alcohol, at least a subset of the BrAC measurementsas attributable to the alveolar breath component but not the interferentbreath component; and performing one of triggering and not triggeringthe IID into a lockout state based on the at least a subset of the BrACmeasurements.
 12. The computing system of claim 11 wherein an alcoholdissipation rate attributable to the interferent breath component of theBrAC measurements exceeds a dissipation rate attributable to thealveolar breath component.
 13. The computing system of claim 12 whereinthe alcohol dissipation rate attributable to the interferent breathcomponent exceeds 0.025 g/100 mL/hour, and the dissipation rateattributable to the alveolar breath component ranges from 0.015 to 0.025g/100 mL/hour.
 14. The computing system of claim 11 wherein the alveolarbreath component is indicative of an alcohol ingestion event.
 15. Thecomputing system of claim 11 wherein the interferent breath component isindicative of a non-ingested alcohol event.
 16. The computing system ofclaim 15 wherein the non-ingested alcohol event is associated with atleast one of a mouthwash liquid, a hand sanitizer fluid, and an ambientvapor.
 17. The computing system of claim 11 further comprisinginstructions causing triggering the IID into the lockout state when thealveolar breath component of the at least a subset of the BrACmeasurements indicates that a predetermined threshold of blood alcoholcontent is exceeded.
 18. The computing system of claim 11 furthercomprising instructions causing not triggering the IID into the lockoutstate when the alveolar breath component of the at least a subset of theBrAC measurements indicates that a predetermined threshold of bloodalcohol content is not exceeded.
 19. The computing system of claim 11wherein the time series of BrAC measurements comprises a series of BrACmeasurements acquired from the pre-identified user at measured timeintervals.
 20. The computing system of claim 19 wherein the measuredtime intervals comprise one of a regular duration and a random durationbetween at least a trio of successive BrAC measurements within the timeseries of BrAC measurements.